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From Mike Subelsky <m...@subelsky.com>
Subject Re: strange load balancing across three nodes
Date Sat, 05 Jun 2010 16:53:10 GMT
Ahh, I think this is the key section I missed:

"you can still have imbalances if your Tokens do not divide up the
range evenly, so you should specify InitialToken to your first nodes
as i * (2**127 / N) for i = 1 .. N."

I'm going to reset my cluster with initial tokens like that. Thanks!

-Mike

On Fri, Jun 4, 2010 at 8:10 PM, Jonathan Ellis <jbellis@gmail.com> wrote:
> The sections on ring management and token selection on
> http://wiki.apache.org/cassandra/Operations will help.
>
> On Fri, Jun 4, 2010 at 2:27 PM, Mike Subelsky <mike@subelsky.com> wrote:
>> Hello everyone,
>>
>> One of my nodes has a much higher load (10x) than the other two nodes.
>>  I don't think it's because a few keys have a lot more columns than
>> others -- the keys are well distributed and I'm using the random
>> partitioner.
>>
>> Could someone point me in the direction of what should I be checking
>> for in a situation like this?  I don't totally understand what the
>> range value represents below but I feel like that be must a clue.  I
>> know I can run loadbalance here but I want to address the underlying
>> problem that caused the imbalance in the first place.
>>
>> Address       Status     Load          Range
>>           Ring
>>
>> 152603206199102353627433717890579536149
>> 10.198.7.47   Up         95.8 MB
>> 2178153229901630557148545713417876599      |<--|
>> 10.210.239.191Up         1.09 GB
>> 129781355096377133235068186455049349192    |   |
>> 10.193.210.192Up         125.44 MB
>> 152603206199102353627433717890579536149    |-->|
>>
>> thanks!
>>
>> -Mike
>>
>> --
>> Mike Subelsky
>> oib.com // ignitebaltimore.com // subelsky.com
>> @subelsky
>>
>
>
>
> --
> Jonathan Ellis
> Project Chair, Apache Cassandra
> co-founder of Riptano, the source for professional Cassandra support
> http://riptano.com
>



-- 
Mike Subelsky
oib.com // ignitebaltimore.com // subelsky.com
@subelsky

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